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RELATED-PARTY TRANSACTIONS (Details) - ECIL-Rapiscan Security Products Limited - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
RELATED-PARTY TRANSACTIONS      
Ownership interest in joint venture (as a percent) 36.00%    
Initial investment   $ 0.1  
Sales to joint venture $ 4.0 4.6 $ 10.2
Receivables from joint venture 1.1 1.9  
Maximum      
RELATED-PARTY TRANSACTIONS      
Equity earnings in joint venture $ 0.1 $ 0.1 $ 0.1
Chairman and Chief Executive Officer      
RELATED-PARTY TRANSACTIONS      
Related party ownership percentage in equity method investee of the reporting entity 10.50%    
Executive Vice President and President of the Company's Security division      
RELATED-PARTY TRANSACTIONS      
Related party ownership percentage in equity method investee of the reporting entity 4.50%    
Chairman and Chief Executive Officer, and Executive Vice President and Director of the Company's Security division | Maximum      
RELATED-PARTY TRANSACTIONS      
Collective voting power control, by entity and related parties, in equity method investment of entity (as a percent) 50.00%